After several hours of uncertainty, Chinese and South Korean monitors concluded Saturday that seismic activity in North Korea was a natural event, and not a nuclear test.

South Korea’s weather agency reported a magnitude 3.0 earthquake in an area of North Korea where the country recently conducted a nuclear test, but assessed the seismic activity as natural.

"The quake is presumed to have occurred naturally," an agency official said, according to South Korea's Yonhap news agency. "A sound wave, which is usually generated in the event of an artificial earthquake, was not detected."

The Korea Meteorological Administration said the activity occurred in Kilju in North Hamgyeong Province. The site is near where North Korea on Sept. 3 conducted its sixth and most powerful nuclear test in what it said was the detonation of a thermonuclear weapon.

Likewise, China's Earthquake Networks Center said an analysis by the seismic service found that the quake "is a natural one," Xinhua, China's official news agency, reported.

Officials with The Comprehensive Nuclear-Test-Ban Treaty Organization also said their initial analysis is that the quake was unlikely to be man-made.

The seismic activity was reported against a backdrop of growing tension over Pyongyang's nuclear and missile intentions.

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In a political rally in Huntsville, Ala., President Trump shared harsh words for Kim Jong Un, calling the North Korean leader a "little Rocket Man."
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North Korean leader Kim Jong Un has vowed to take the "highest-level" action in response to President Trump's threat to "totally destroy" the North over its nuclear and missile programs.

North Korean Foreign Minister Ri Yong-ho said in New York on Thursday that Pyongyang may consider its most powerful test of a hydrogen bomb over the Pacific Ocean.

"This could probably mean the strongest hydrogen bomb test over the Pacific Ocean," he told reporters in response to a question about what action the North Korean regime might take against the U.S.

"Regarding which measures to take, I don't really know since it is what Kim Jong Un does," Ri said.

Meanwhile, China announced on Saturday that it will limit exports of petroleum products to North Korea starting in October under the terms of the latest U.N. sanctions passed in response to North Korea's sixth nuclear test.

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A ballistic missile is displayed in Kim Il Sung Square during a military parade in Pyongyang, North Korea. The parade celebrated the 105th birth anniversary of Kim Il Sung, the country's late founder and grandfather of current ruler Kim Jong Un. Wong Maye-E, AP

The Korean People's Army tanks are displayed during a military parade marking the 105th anniversary of the birth of late North Korean leader Kim Il-Sung in Pyongyang on April 15, 2017. Ed Jones, AFP/Getty Images

North Korean men and women wave flags and plastic flowers as a float with model missiles and rockets with words that read "For Peace and Stability in the World" during a military parade in Pyongyang, North Korea. Wong Maye-E, AP

In what military experts say appears to be a North Korean KN-08 Intercontinental Ballistic Missile (ICMB) is paraded across Kim Il Sung Square during a military parade in Pyongyang, North Korea. Wong Maye-E, AP

Korean People's Army soldiers march on Kim Il-Sung sqaure during a military parade marking the 105th anniversary of the birth of late North Korean leader Kim Il-Sung, in Pyongyang. Ed Jones, AFP/Getty Images